var open = document.querySelector(".a4")
var close = document.querySelector(".tanchuang .close")
var hei = document.querySelector(".hei")
var tanchuang = document.querySelector(".tanchuang")

open.onclick = function(){
	hei.style.display = 'block'
	tanchuang.style.display = 'block'
}

close.onclick = function(){
	hei.style.display = 'none'
	tanchuang.style.display = 'none'
}

